A 9-year-old spayed female Jack Russell Terrier presented to Cornell's Emergency Service for a 6 week history of vomiting and diarrhea due to a previously diagnosed jejuna! mass. A partial jejuna! resection and anastomosis was completed and histopathology of the mass revealed mucinous adenocarcinoma with clean margins. The patient re-presented 7 months later with an acute onset of left pelvic limb lameness. Radiographs, ultrasound and computed tomography (CT) studies revealed a focal, monostotic, aggressive bone lesion in the proximal left femur. The patient underwent a left coxofemoral disarticulation procedure and histopathology of the left pelvic limb revealed metastatic mucinous adenocarcinoma with invasion of the adjacent soft tissue.